DE102015100274A1 - Method for closing a vertical borehole - Google Patents

Abstract

The invention relates to a method for closing a vertical borehole, in particular a well hole and / or a groundwater measuring point, comprising at least the following steps: a. Forming at least one opening in a lateral surface of at least one well pipe; b. Placing an auxiliary body on an at least partially surrounding the well pipe annulus, which is bounded by a circumferential borehole wall and which is at least partially filled with annulus filling material; c. Inserting the auxiliary body in the vertical direction into the annular space between the well pipe and the borehole wall; Filling the auxiliary body with at least one curing material.

Description

The invention relates to a method for closing a vertical borehole, in particular a well hole and / or a groundwater measuring point.

In order to ensure sufficient water supply for the growing population, drilling wells and / or deep wells with great depths were developed between 1950 and 1990 in particular. Often such wells intersect several groundwater floors. The drilling then often took place without sufficient sealing, so that the normally separate groundwater layers mix with each other due to the insufficient borehole seal. According to current standards, this is no longer permitted, because nowadays it must be ensured that water from different groundwater layers does not mix with one another.

In addition, the aging process of the materials proves to be disadvantageous. Deposits and corrosion significantly affect the water quality in vertical wells, especially well wells and / or groundwater monitoring points. Therefore, it is necessary existing wells and / or groundwater measuring points, which the o.g. No longer meet requirements, safely seal. In particular, deep wells can not simply be shut down, but must be dismantled and then securely closed to prevent soil and personal injury. Such dismantling proves to be costly and risky, especially in loose rock, since there is a risk that the existing loose stone wall hole collapses and it comes to soil shifts.

Accordingly, the present invention has for its object to provide a method for closing a vertical wellbore, which creates a watertight connection and thus reliably seals the horizontal, dense soil layers and contributes to a horizontal barrier. Furthermore, the method described here allows a cost-effective and easy dismantling.

• a. Ausbilden wenigstens einer Öffnung in einer Mantelfläche wenigstens eines Brunnenrohres;
• b. Aufsetzen eines Hilfskörpers auf einen zumindest teilweise das Brunnenrohr umgebenden Ringraum, welcher von einer Bohrlochwand umfangsseitig begrenzt wird und welcher mit Ringraumfüllmaterial zumindest teilweise ausgefüllt ist;
• c. Einführen des Hilfskörpers in vertikaler Richtung zwischen Brunnenrohr und Bohrlochwand;
• d. Verfüllen des Hilfskörpers mit wenigstens einem Aushärtematerial.

This object is achieved according to the features of claim 1. This discloses a method for closing a vertical borehole, in particular a well hole and / or a groundwater measuring point, comprising at least the following steps:

• a. Forming at least one opening in a lateral surface of at least one well pipe;
• b. Placing an auxiliary body on an at least partially surrounding the well pipe annulus, which is bounded by a circumferential borehole wall and which is at least partially filled with annulus filling material;
• c. Inserting the auxiliary body in a vertical direction between the well pipe and the borehole wall;
• d. Filling the auxiliary body with at least one curing material.

Usually, wells and / or groundwater measuring points consist of a vertical borehole with a borehole wall formed by the surrounding soil and a hollow well pipe arranged within the borehole for conveying water. The distance between the well pipe and the borehole wall is to be understood as an annular space which at least partially, advantageously completely, encloses the outer surface of the well pipe facing the ground. This annular space is formed filled with annular space filling material for additional stabilization of the well pipe.

Depending on the nature of the material, the annular space filling material consists of particles of different size and geometry. For example, the particles may have a particle diameter in the range of 2 μm to 2 mm, as is the case with sand. Furthermore, it is also conceivable that the annular space filling material has a significantly larger particle diameter and is formed, for example, of gravel. In this case, the particle diameter is advantageously in the range of 2 mm to 63 mm. Of course, this is not to be understood as limiting, so that other annular space filling materials with even larger particle diameters are used. This list is only to be understood as an example and shows that the term annulus filling material particles is to be understood as meaning both a broad material range and a broad size range.

The method described here is particularly advantageous for vertical holes, in particular of wells and / or groundwater measuring points, which are introduced in the loose rock.

Loose rock (soil classes 1-5) is to be understood as meaning, in particular, soil materials which are predominantly unconsolidated, loose, without solid cohesion or free-flowing. Examples of such unconsolidated soil are soil materials such as gravel, gravel, sand, silt, clay or the like, or a combination thereof.

Such uncontaminated wells and / or unconsolidated groundwater measuring points are particularly difficult to disassemble, since with the removal of annulus filling material and / or well pipe, in particular below the groundwater level, there is a risk that the borehole wall collapses and consequently no reliable sealing of the more groundwater-bearing soil layers can be guaranteed.

If wells and / or groundwater measuring points with only small annulus diameters of, for example, 50 to 100 mm are to be dismantled and / or uncovered, this small diameter in combination with great depths up to 400 m requires an extremely high outlay and also an extremely high risk for equipment and Staff.

With the method described herein wells and / or groundwater measuring points, in particular loose rock wells and / or unconsolidated groundwater measuring points, can be dismantled and / or securely closed in a simple, cost effective and safe manner without the borehole wall collapsing and soil shifts occurring.

In a first step of the method according to the invention, it is provided to form the lateral surface of the existing well pipe, that is to say the well pipe wall, with at least one opening. This at least one opening is advantageously designed such that it directly connects the inner volume of the well pipe, which serves to convey water or as a water reservoir, to the annular space and / or the annular space filling material. Advantageously, this at least one opening is designed as a continuous opening, so that annular space and inner volume of the well pipe are permanently connected. As a result, an exchange of material between the annular space and the inner tube volume can advantageously take place.

Substance exchange is to be understood in particular as meaning that a substance from the annular space, that is to say the space between the well pipe and the borehole wall, is transferred through the at least one opening into the interior volume of the well pipe or vice versa. Substances for the mass transfer are gases, such as air, liquids, such as water, or solids, such as annulus filling or a combination thereof to understand.

The at least one opening can be embodied variably in its geometry and can be made, for example, round, angular or otherwise polygonal.

The at least one opening is advantageously introduced by means of blasting, water-abrasive cutting, mechanical perforation, hydraulic perforation, shot perforation, high-pressure perforation or the like in the lateral surface of the well pipe, so the Wellrohrwandung. The choice of the appropriate method depends on the material of the well pipe.

Furthermore, it has proved to be advantageous to provide a plurality of such openings in the well tube wall. The arrangement of the openings can for example be horizontal, so that a plurality of openings, preferably three to fifteen, span a horizontal common plane. It is also conceivable to create a plurality of such horizontal planes, which are further advantageously formed equidistantly from each other. Further advantageously, the openings of two mutually adjacent planes arranged offset from one another, so that there is a hexagonal arrangement of the openings. This is particularly advantageous in round openings, since a large number of openings can be introduced into the lateral surface of the well pipe by the hexagonal arrangement and at the same time the outer surface remains stable.

It has also proven to be advantageous that the openings along the vertical orientation of the well pipe, advantageously extend at regular intervals and thereby opening groups are formed. Thus, it is conceivable that a plurality of openings formed in the vertical direction offset from each other and describe, for example, a spiral shape along the lateral surface of the well pipe.

Moreover, the diameter of the openings, regardless of their geometric extent advantageously designed such that the diameter is greater than the diameter of the annulus Füllmaterialpartikel. This allows a mass transfer between annulus and well inner volume.

After the predeterminable number of openings have been introduced into the well tube wall, ie the well tube lateral surface was perforated in a predetermined manner, in a second process step, an auxiliary body on the at least partially surrounding the well tube annulus, which is circumferentially bounded by the borehole wall and which at least partially with Ringraumfüllmaterial filled in, put on. In the simplest case, the auxiliary body corresponds in its geometric shape to the well pipe and / or the borehole wall. Advantageously, the auxiliary body has a round diameter. Further advantageously, the auxiliary body is arranged concentrically around the well pipe, so that the auxiliary body is equally spaced from the well pipe to all sides. By placing it is advantageous to understand that the auxiliary body at least partially comes into contact with the arranged in the annulus, the free surface of the annulus filling material, for example, common Forms contact surfaces. A placement can also be done by the auxiliary body, as described in the further process step, directly into the annulus, so the at least partially filled with annulus filling ring space, advantageously in the vertical direction, is introduced. Again, advantageously corresponds to the first contact between the annulus and / or annulus filling material on the one hand and auxiliary body on the other hand a touchdown. In addition, a longer residence time of auxiliary body on the annular space or the annular space filling material can also be understood by placement, for example for concentric alignment with respect to the borehole wall and / or the well pipe.

For the successful implementation of the method according to the invention, it is advantageous if the auxiliary body inner diameter is greater than the Brunnenrohraußendurchmesser and / or the auxiliary body inner diameter and / or the Hilfskörperaußendurchmesser is less than or equal to the borehole wall inner diameter. The auxiliary body forms when placed on the annulus filling material with this at least partially a common contact surface. This is the greater, the smaller the annulus Füllmaterialpartikel are formed in their diameter.

In a subsequent further step, the auxiliary body is inserted in the vertical direction between the well pipe and borehole wall in the annulus. This is advantageous since with the introduction of the auxiliary body at the same time the annular space filling material is at least partially, advantageously completely, transferred from the annular space in the hollow inner volume of the well pipe. This is made possible by the above-described openings in the well tube wall. At the same time, the introduced auxiliary body stabilizes and supports the borehole and the surrounding soil so that collapses are avoided.

Advantageously, the auxiliary body is introduced vertically to the predetermined depth, in which the well and / or the groundwater measuring point to be closed. For this purpose, the auxiliary body may be integrally formed. This is advantageous since, as a result, a continuous introduction of the auxiliary body can take place from the surface of the earth to the desired well depth. In addition, the one-piece auxiliary body can later be easily removed from the ground again. Depending on the nature of the well and / or the groundwater measuring point, it is conceivable to introduce the auxiliary body so deeply into the annulus that the auxiliary body extends in the vertical direction longer than the well pipe and / or that the auxiliary body with the base of the borehole forms a common contact surface , In addition, it is also conceivable that the auxiliary body is introduced into the well only to a predeterminable depth, so that the auxiliary body is shorter than the borehole and / or the well pipe.

The method described here can always be carried out reliably and safely, regardless of the depth of insertion of the auxiliary body.

Optionally, during the introduction and / or after the introduction of the auxiliary body into the annular space, the annular space filling material, which is thereby at least partially transferred into the well pipe, is removed from the well pipe. Depending on its particle size, the annular space filling material can be removed simply and cost-effectively by at least one suction tube from the inner volume of the well pipe. This can be done in the simplest case with compressed air or vacuum. In the same step, remaining annular space filling material between the well pipe and the auxiliary body is advantageously also removed, so that a hollow volume continues to be advantageous.

This process step provides a quick, simple and low-risk solution for removing the permeable annular space filling material that is to be removed during the decommissioning or filling of wells and / or groundwater measuring points from the borehole.

Subsequently, the auxiliary body is filled with at least one curing material. This is advantageous since, after the removal of the annular space filling material and / or the well pipe, the auxiliary body forms a free volume which is stabilized by the hardening material and filled up to protect persons. For this purpose, the at least one curing material is introduced into the volume spanned by the auxiliary body. At least one clay mineral, for example at least one phyllosilicate, such as montmorillonite, is advantageously used as the hardening material. In addition, the curing material may include other materials from the group quartz, mica, feldspar, pyrite, calcite, sand, gypsum, limestone or a combination thereof. Furthermore, it is conceivable that additional additives, such as, for example, binders, additives, fillers or the like, are added to the curing material. For improved fillability, the curing material is slurried with water, so that forms a suspension. This Bohrspülung is filled in the simplest case with a Rohrzuführsystem in the volume of the auxiliary body. Bentonite has proved to be particularly advantageous as a hardening material due to its thixotropic properties. In addition, it is also conceivable to form the curing material as a cement-clay mixture.

Of course, the number of process steps is not to be understood as limiting, so that further intermediate steps can be carried out between the steps listed here.

Further advantageous embodiments will become apparent from the dependent claims.

In a further advantageous method step, the auxiliary body is vibrated at least temporarily before and / or during insertion into the annular space between the borehole wall and the well pipe. This results in both vertical and horizontal vibration components. This is advantageous because the auxiliary body can be introduced by the swinging without much force in the annulus, so in the annulus filling material. Furthermore, the vibrations allow the safe introduction of the auxiliary body in great depths of up to 400 m.

It is conceivable that the auxiliary body is placed on the annulus filling material at rest and is set in vibration only after touchdown. On the other hand, it is also conceivable that the auxiliary body is vibrated prior to placement on the annulus filling material and vibratingly enters into contact with the annulus filling material and enters it. Advantageously, the oscillation at least temporarily, more advantageously permanently. Here, it is also conceivable that the auxiliary body oscillates permanently, but the frequency during the oscillation period, for example, during insertion, at least once, advantageously changes several times. The duration of the initiated oscillation and its frequency is advantageously selected as a function of the material to be penetrated by the auxiliary body.

The vibration of the auxiliary body also proves to be advantageous because a small force is required for insertion into the annular space material. In addition, the vibrating auxiliary body can also be introduced much faster in the annulus filling, so without vibration exposure. To generate the vibration, at least one vibration-generating device, for example a vibrating hammer or a leader, is used. This is advantageous directly with a free end of the auxiliary body in conjunction.

It has also proved to be particularly advantageous that the auxiliary body emits vibration waves and / or vibrations and / or pulses into the annulus before and / or during insertion into the annulus. The auxiliary body itself, as stated above, excited by a vibration generating device to vibrate. The vibrations are released to the environment so that the annulus filling material experiences vibration. The introduced oscillation loading is advantageously sufficient so that the material friction of the annular space filling material is overcome and a flow movement of the annular space filling material results. As a result of this material liquefaction, the solid annular space filling material flows at least partially through the openings of the well pipe into its internal volume. Vibrations are to be understood as meaning any kind of vibrations, for example low-frequency vibrations. Depending on the annular space filling material, it may also be advantageous to introduce medium-frequency or even high-frequency vibrations into the auxiliary body. In particular, the introduction of vibrations during insertion of the auxiliary body into the annular space filling material has proven to be advantageous in order to transfer fine-grained annulus filling material from the annulus into the well pipe in a short time. Advantageous frequencies are in the range of 10 Hz to 100 Hz. Even more advantageously in the range of 20 Hz to 60 Hz.

Furthermore, it is advantageous to emit the vibrations or vibrations in time intervals, for example as pulse sequences. Such pulse sequences are also well suited to transport the annulus filling material. The auxiliary body transports the annular space filling material indirectly into the inner volume of the well pipe, where it can be easily removed.

In a further advantageous embodiment, the auxiliary body is introduced into the borehole along the contact surface of annulus filling material and borehole wall. This is advantageous, especially if the borehole wall consists of loose rock, which itself is often arranged loosely. If the annulus filling material were to be removed from the annulus without sufficient support by the auxiliary body, the borehole would collapse in an uncontrolled manner. Therefore, it is advantageous to introduce the auxiliary body such that its outwardly directed lateral surface is guided along the contact surface of annulus filling material and borehole wall in the borehole so as to obtain the greatest possible stabilization and support. Of course, this is not limiting, so that a distance to the borehole wall is conceivable. In this case, annulus filling material remains between the borehole wall and the auxiliary body.

It has also proved to be advantageous for the stabilization of the borehole wall when the outer diameter of the auxiliary body corresponds to 75% to 100%, advantageously 85% to 100% and more preferably 95% to 100%, the inner diameter of the borehole wall. If, for example, it is a borehole with a bore hole inside diameter of 800 mm, then the auxiliary body to be introduced points Advantageously, an outer diameter in the range of 650 mm to 800 mm.

Of course, this is not to be understood as limiting, so that, depending on the loose rock, it is also conceivable that the auxiliary body has an inner diameter which corresponds to the inner diameter of the borehole wall.

Further advantageously, before filling the auxiliary body, an intermediate step takes place in which the well pipe is completely removed up to the predetermined depth. At a predetermined depth, both the complete depth of the well and / or the groundwater measuring point can be understood, or else only a predetermined area. So it is also conceivable that in a lowermost portion of the borehole, which forms the bottom portion or the base of the borehole, well pipe and / or annulus filling remains and the auxiliary body is not completely placed on the base of the well and / or the groundwater measuring point. In the simplest case, this is physically divided into sections, for example by means of cutting, and removed from the borehole by means of pipe lifter or lifting cap for removing the well pipe.

In a further advantageous embodiment, the method comprises a further advantageous step, in which the auxiliary body is removed from the borehole after it has been filled and / or after curing of the hardening material. This is advantageous if the auxiliary body consists of corrodible material, such as metal, steel or the like. The aging process in the soil can lead to contamination of the groundwater, so that the auxiliary body must be removed from the borehole again. Due to the hardened hardening material, this is easily possible, so that the auxiliary body can be pulled out of the borehole and dismantled. The well itself is sufficiently supported and stabilized by the hardening material.

In a further advantageous embodiment, the method comprises a further advantageous step in which the strand-like curing material is drilled. This is advantageous if, as curing material, no material prescribed according to DVGW Code of Practice W 135 was used for backfilling.

It has also been found advantageous that the strand-like Aushärtematerialkörper is drilled so that a lateral surface with a predeterminable wall thickness remains and results in a substantially cylindrical hollow body. The predeterminable wall thickness is selected as a function of the material properties of the loose rock, as a function of the borehole diameter and as a function of the borehole depth. In this case, it is conceivable that the bore takes place uniformly within the hardening material, so that a cylindrical hollow body results. In addition, however, it is also conceivable, in particular in the case of large depths of the borehole, to form the bore at least in sections in an undulating and / or conical manner, that is to say vary in its diameter. This gives extra stability, especially at great depths.

In a further advantageous embodiment, the method comprises a further advantageous step, in which the hollow body consisting of hardening material is filled with at least one filling material. This serves the final stabilization and securing of the borehole against personal injury or groundwater contamination. By introducing backfill material, the original hydrogeological conditions are advantageously restored, so that the separating layers of the groundwater floors are intact again. Any materials that are permissible according to DVGW Code of Practice W 135, such as clay, twilight or cement-clay mixtures, can be used as backfill material.

Furthermore, the present invention also encompasses a system for closing a vertical borehole, in particular a well hole and / or a groundwater measuring point, which comprises at least one well pipe, an annular space filled at least in sections with annular space filling material bounded by a borehole wall System comprises at least one auxiliary body and at least one vibration generating means, which is designed such that it vibrates the auxiliary body before and / or during insertion into the annular space. Furthermore, it is conceivable that the system further comprises filling devices for supplying the curing material and / or the filling material and / or suction devices for removing the annular space filling material. It has proved to be particularly advantageous if the auxiliary body is designed as a cylindrical hollow body corresponding to the well pipe and / or the borehole wall. Of course, this is not limiting, so that it is also conceivable to form the auxiliary body, for example, as a frame-like, rectangular Holkörper.

Advantageously, the auxiliary body made of metal, even more advantageously made of steel.

Advantages and expediencies can be found in the following description in conjunction with the drawing. Hereby show:

1 a sectional view of a well and / or a groundwater measuring point;

2 a sectional view of a well and / or a groundwater measuring point after the first process step;

3 a sectional view of a well and / or a groundwater measuring point during a further process step;

4 a sectional view of a well and / or a groundwater measuring point in a further method step;

5 a sectional view of a well and / or a groundwater measuring point in a further method step;

6 a sectional view of a well and / or a groundwater measuring point in a further method step;

7 a sectional view of a well and / or a groundwater measuring point in a further method step; and

8th a sectional view of a well and / or a groundwater measuring point after closing.

1 shows a schematic sectional view of a well and / or a groundwater measuring point 1 which is to be dismantled, for example due to age.

In the following, only the well will be referred to by way of example, with the statements analogous to a groundwater measuring point being valid.

The fountain 1 consists of a borehole 2 whose borehole wall 4 of loose rock 6 is trained. Inside the vertical borehole 2 is a well pipe 8th arranged centrally. The well pipe 8th serves as a water reservoir and for water extraction. The well pipe 8th is over the annulus 10 from the borehole wall 4 spaced apart. The annulus 10 encloses advantageous the well pipe 8th and stabilizes this compared to the loose rock 6 , The annulus 10 is with annulus filling material 12 , For example, quartz sand, filled. In the upper section of the fountain 1 is an upper seal 13 arranged. This serves for additional stabilization and sealing against surface water. In this embodiment, the borehole is 2 formed deeper in the vertical direction than the well pipe arranged therein 8th ,

In 2 is another sectional view of a Brunnes 1 shown after the first process step has been performed. The same reference numerals as above correspond to the same components, so that they will not be explained again here. In the lateral surface 14 of the hollow well pipe 8th be a variety of openings 16 brought in. These openings 16 are advantageously round, slot-like or rectangular. By way of example, here are three openings 16 arranged equidistant from each other and form an opening group. Along the well pipe 8th Several of these opening groups are provided. The number depends on the depth of the well 1 , Advantageously, the opening groups are arranged equidistant from each other in the range of 20 cm to 50 m. Of course, the number of three openings 16 per opening group is not limiting, so that more than three openings, for example, four, five, six, ten or even fifteen openings per opening group can be introduced.

3 shows a schematic representation of a well 1 in which the auxiliary body 20 in the annulus 10 is at least partially introduced. The auxiliary body 20 is advantageous as a cylindrical hollow body, advantageously made of steel. The auxiliary body 20 gets into the annulus during vertical insertion 10 at least temporarily subjected to one or more vibrations. This is done with at least one vibration generating device (not shown), for example a vibrating hammer. This displaces the auxiliary body 20 at least temporarily in vibration. This allows the auxiliary body 20 Easy and low-risk for the operator in the annulus 10 introduce. Advantageously, the auxiliary body oscillates 20 and gives these vibrations to the environment, here the annulus filling material 12 from. This annulus filling material 12 is thereby also vibrated, so that advantageously the material friction between the annulus filling material particles is overcome and this through the openings 16 in the interior volume 22 of the well pipe 8th flow. The vibrations may advantageously be low frequency oscillations. In addition, it is also conceivable that the vibrations as vibrations in the middle frequency range or high frequency range in the auxiliary body 20 initiate, which then vibrates accordingly and the vibrations to the environment, so to the annulus filling material 12 emits. In addition, it is also conceivable to use vibrations and / or vibrations in a combined sequence. Furthermore, it is conceivable to initiate the oscillations and / or vibrations in a time-limited and predeterminable manner so that a controlled pulse sequence results. Depending on the nature of the annulus filling material 12 Vibrations, vibrations or pulses or a combination of these, in the auxiliary body 20 be initiated.

4 shows a fountain 1 in which the auxiliary body 20 is already introduced to the desired depth and the annulus filling material 12 already removed. The distance between auxiliary body is advantageous 20 and borehole wall 4 low, giving the loose rock 6 as little space as possible is left. This stabilizes the entire borehole 2 ,

In 5 is the fountain 1 shown according to a further advantageous method step. Here was the well pipe 8th already removed, leaving the hollow auxiliary body 20 a free volume V spans. This free volume V will, as in 6 shown with at least one curing material 24 , For example, a drilling fluid, more preferably a bentonite-water suspension filled.

In 7 the subsequent process step is shown, in which the auxiliary body 20 is being dismantled and removed from the borehole 2 Will get removed. There remains the strand-like curing material 24 which is the entire borehole 2 stabilized and protects against collapse.

The string-like curing material 24 can be drilled concentric in the further process, so that it ultimately results in a tubular hollow body. This hollow body (not shown) and / or the annulus still surrounding the hollow body 10 becomes in a final process step with suitable backfill material 26 filled up, leaving the borehole 2 completely and securely closed from above ( 8th ).

All disclosed in the application documents features are claimed as essential to the invention, provided they are new individually or in combination over the prior art.

LIST OF REFERENCE NUMBERS

1

Well / groundwater measuring point

2

well

4

borehole wall

6

soft ground

8th

well pipe

10

annulus

12

Annulus filler

13

Upper seal

14

lateral surface

16

opening

20

auxiliary body

22

Inner volume of the well pipe

24

Aushärtematerial

26

backfill

Claims (10)

Method for closing a vertical borehole ( 2 ), in particular a well hole ( 1 ) and / or a groundwater measuring point ( 1 ) comprising at least the following steps: a. Forming at least one opening ( 16 ) in a lateral surface ( 14 ) at least one well pipe ( 8th ); b. Placing an auxiliary body ( 20 ) on at least partially the well pipe ( 8th ) surrounding annulus ( 10 ), which from a borehole wall ( 4 ) is peripherally limited and which with annulus filling material ( 12 ) is at least partially filled out; c. Inserting the auxiliary body ( 20 ) in the vertical direction in the annulus ( 10 ) between well pipe ( 8th ) and borehole wall ( 4 ); d. Filling the auxiliary body ( 20 ) with at least one curing material ( 24 ). Method according to claim 1, characterized in that the auxiliary body ( 20 ) before and / or during insertion into the annulus ( 10 ) between borehole wall ( 4 ) and well pipe ( 8th ) is vibrated at least temporarily. Method according to claim 2, characterized in that the auxiliary body ( 20 ) before and / or during insertion into the annulus ( 10 ) Vibration waves and / or vibrations and / or pulses into the annulus ( 10 ). Method according to claim 1, characterized in that the auxiliary body ( 20 ) along the contact surface (K) of annulus filling material ( 12 ) and borehole wall ( 4 ) in the borehole ( 2 ) is introduced. Method according to claim 1, characterized in that it further comprises the following step: e. Removing the auxiliary body ( 20 ) from the borehole ( 2 ) after its filling and / or after hardening of the hardening material ( 24 ). A method according to claim 1 or 5, characterized in that it further comprises the following step: f. Drilling out the strand-like hardening material ( 24 ). A method according to claim 6, characterized in that the strand-like Aushärtematerialkörper ( 24 ) is drilled so that a lateral surface with a predeterminable wall thickness remains and results in a substantially cylindrical hollow body. Method according to claim 7, characterized in that it further comprises the following step: g. Filling the hollow body ( 20 ) of hardened hardening material ( 24 ) with at least one filling material ( 26 ). System for closing a vertical borehole ( 2 ), in particular a well hole ( 1 ) and / or a groundwater measuring point ( 1 ), at least comprising a well pipe ( 8th ), the well pipe ( 8th ) at least partially surrounding annular space ( 10 ), which from a borehole wall ( 4 ), characterized in that the system further comprises at least one vibration generating device, which is designed such that it the auxiliary body ( 20 ) before and / or during insertion into the annulus ( 10 ) vibrated. System according to claim 9, characterized in that the auxiliary body ( 20 ) is designed as a cylindrical hollow body.

Images